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Trihal Cast resin transformer

VIEWS: 331 PAGES: 32

Cast resin
type                                    4
standard                                4
range                                   4
basic equipment                         5

magnetic core                           6
low voltage winding                     6
high voltage winding                    6
high voltage casting                    7

thermal protection                 8 to 11
forced transformer ventilation          12
connection                              13
protective enclosure                    14
vibration damper                        14
network protection                      14
infra-red measurement port-hole         14

fire behaviour                          15
climatic tests                          16
environment tests                       16
electrical tests                  17 to 19

internet                          20 to 21

general information                     22
ventilation                             23
connections                       24 to 25
10 commissioning precautions            26

overloads                              27
handling and storage                   28

commissioning and maintenance     29 to 30

after sales service                    31

                                                          (   A technology developed and
                                                              patented by France Transfo since 1985.

                                                              Trihal is a three-phase dry type transformer cast under vacuum in epoxy resin with an
                                                              active filler.
                                                              It is this active filler, essentially composed of trihydrated alumina, which is the origin of
                                                              the Trihal trademark.
                                                              Trihal is an indoor type transformer (for outdoor installation, please consult us).

                                                              Trihal complies with standards :
                                                                 IEC 76-1 to 76-5 ;
                                                                 IEC 726 (1982) ;
                                                                 CENELEC (European Committee for Electrotechnical Standardization)
                                                              harmonization document HD 398-1 to 398-5, HD 538-2 S1 : 1995, HD 464-S1 :
                                                              1988/A4 : 1995, concerning dry type transformers.
400 kVA, 20 kV/410 V, IP00
250 kVA, 20 kV/410 V, IP31
                                                                 HV/LV distribution transformers from 160 to 2500 kVA up to 24 kV
                                                              (36 kV please consult us).
                                                              For higher rated power and voltages, please consult us.
                                                              Trihal transformers are supplied in many versions :
                                                                 without enclosure (IP00) ;
                                                                 with IP31 metal enclosure : see the different types on pages «options».
                                                              Please note! The resin provides insulation for the MV winding but does not provide
                                                              protection from direct contact. Only the protective enclosure version provides this
                                                                 HV/HV power transformers up to 15 MVA and 36 kV.
                                                              Please consult us.

                                   Ennery assembly line


                                       basic equipment
                                       version without protective enclosure (IP00).
                                         4 flat multi-direction castors ;
                                         4 lifting lugs ;
                                         haulage holes on chassis ;
                                         2 earthing locations ;
                                         1 rating plate (MV side) ;
                                         2 “electrical hazard” warning labels (signal C10) ;
                                         off circuit tapping links, opperational when transformer is de-energised, acting on
                                       the highest voltage to adapt the transformer to the true supply voltage ;
                                         MV connection bars with connections from above ;
                                         LV connections from above ;
                                         1 test certificate and an installation, commissioning and maintenance manual.

                                       version with IP31 protective metal enclosure.
                                          TRIHAL transformer without protective enclosure (IP00) as described above ;
                                          1 metal IP31 (apart from the base: IP21) protective enclosure :
                                          with standard anti-corrosion protection ;
                                          lifting lugs for handling of transformer with its enclosure ;
                                          1 bolted panel on the MV side for access to MV connections and tapping points,
                                       fitted with 2 handles, an “electrical hazard” warning label (signal T10), a rating plate
                                       and a visible braid for earthing ;
630 kVA - 20 kV/400 V
                                          drilled holes (with covers) on the left of the bolted MV side panel, intended for the
                                       mounting of an ELP1 type or a Profalux type P1 keylock ;
                                          2 panels to be drilled to pass the cables through cable glands on the enclosure
                                       roof: 1 MV side, 1 LV side (pilot holes and cable glands not supplied) ;
                                          1 gland plate situated on lower right hand MV side for possible incoming MV cable
                                       connection from below.

                                       technology and construction
                                       Trihal, entirely designed and produced by France Transfo benefits from two key patented
                                       processes :
                                          a linear voltage gradient from the top to bottom of HV coil ;
                                          a fireproof casting system.

                                       This technology, patented by France Transfo is implemented in the Ennery plant in
                                       France. The companies large production capacity ensures deliveries meet clients
                                       particular needs.

                                       quality system
                                       The certificate issued by AFAQ (French Association for Quality Assurance) states that
                                       Trihal transformers are manufactured in accordance with a quality system in compliance
                                       with the international standard ISO 9001.

                                       environmental protection
                                       France Transfo, European leader in cast resin distribution transformers, is the first French
                                       manufacturer to be certified to ISO 14001 in this sector, and has been so since 1998.
                                       Trihal, is designed and produced to be environmentally friendly, providing an ecological
                                       response for MV/LV transformers.
                                       Environmental protection is integrated in management systems in order to promote the
                                       protection of all natural resources and continuously improve conditions for a clean envi-
                                       Product design focuses on minimising environmental impact.


                                               Very low partial discharge level ( 10 pC)
                                               provides an excellent impulse strength.

                                               magnetic core
                                               The magnetic core is made from laminations of grain oriented silicone steel insulated with
                                               mineral oxide.
                                               The choice and grade of steel and the cutting pattern and method of assembly minimises
                                               the loss level and the no-load current with the effect of a very low noise level.
                                               Once assembled, it is corrosion protected using a class F, oven-dried alkyd resin.

                                               low voltage winding
                                               The low voltage winding is made of either aluminium or copper foil (according to
                                               manufacturer’s preference) in order to achieve zero axial stresses under short circuit
                                               conditions; the foil is insulated by a class F inter-layer film, pre-impregnated with
                                               heat-activated, epoxy resin.
magnetic core in assembling
                                               The ends of the winding are protected and insulated using a class F insulator, coated with
                                               heat-activated epoxy resin.

                                               The whole winding is polymerised by being placed in an autoclave for 2 hours at 130°C
                                               which guarantees :
                                               - outstanding resistance to industrial atmosphere aggression,
                                               - excellent dielectric withstand,
                                               - very good resistance to radial stresses under bolted short circuit conditions.
                                               Each LV winding terminates in a tin plated aluminium or copper connection point,
                                               enabling connections to be made without using a contact interface (grease, bi-metal
                                               Assembly is carried out according to current practices, including using spring pressure
                                               washers under nut and screw heads.

                                               high voltage winding
                                               The high voltage winding is usually wound from insulated aluminium or copper wire, using
                                               a method developed and patented by France Transfo : “a linear voltage gradient from the
                                               top to the bottom”.
                                               For higher currents, the medium voltage winding may be wound using so-called “strip”
                                               These methods are used to obtain very low stress levels between adjacent conductors.
                                               This winding is cast and moulded under vacuum in a class F loading and fireproofed resin
                                               : the Trihal casting system.
                                               These processes combine to give coils of very high dielectric properties with very low
                                               partial discharge level (guaranteed 10 Pc) which is a decisive factor in influencing
LV polymerization kiln
                                               the transformer’s life span and its lightning impulse withstand.
                                               MV tapping points on the copper connection bars enable connections to be made
                                               without using a contact interface (grease, bi-metal strip). Assembly is carried out
                                               according to current practices, including using spring pressure washers under nut and
                                               screw heads.

winding an HV coil in strip


                             PROCESS DIAGRAM
                                                                                           high voltage casting system
                     Pneumatic transfer (SILICA+ALUMINA )
                                                                                           The system provides a vacuum cast coating of fire resistant filled resin, a technology
                                                                                           developed and patented by France Transfo.
                                                                                           The class F casting system comprises :
                                                                                              a bisphenol based epoxy resin with a suitable viscosity to ensure excellent
                                     PRE-MIXERS                                            impregnation of the windings ;
                                                                     Colouring                an anhydride hardner modified by a flexiblishing additive. This type of hardner
      Heated                                                         dispensing)           assures very good thermal and mechanical properties. The flexiblishing additive
      hardener                                                       Heated resin          gives the casting system the necessary elasticity to prevent cracking during
                                                                                           operation ;
                                   BUFFER TANKS
                                                                                              an active powdered filler composed of silica and especially of trihydrated
                                                                                           alumina througly mixed with the resin and the hardner.
                                                                                           Silica reinforces the casting’s mechanical strengh and improves heat dissipation.
       Continuous                                                    Continuous
       circulation                                                   circulation
                                                                                           The trihydrated alumina guarantees the Trihal transformer's intrinsic fire performance.
                                       PUMPS                                               The trihydrated alumina produces 3 anti-fire effects which occur in case of calcination of
                                                                                           the casting system (when the transformer is exposed to flames).
                                    STATIC MIXER
                                                                                           - 1st anti-fire effect(1) : refracting shield of alumina.
                                                                                           - 2nd anti-fire effect(1) : barrier of water vapour.
                                                             Poured as required
 Flow rate adjustment via outlet                                                           - 3rd anti-fire effect(1) : temperature held below the fire point.
 (casting nozzle)
                                                                                           The result of the combination of the 3 anti-fire effects is immediate self extinguishing of
                                                                                           the Trihal transformer (1).
                                                                           Previously      In addition to its dielectric qualities, the casting system gives the Trihal transformer
                                                                           pre-heated      excellent self extinguishing fire resistance and excellent environmental protection
                                                                           To oven for     against aggressive industrial atmospheres.
                                                                           gelling and
                             6 STANDARD MOULDS PER TROLLEY                polymerisation

                                                                                           high voltage coil casting process
                                                                                           The process from proportioning the resin up to polymerization, is fully controlled by
                                                                                           microprocessor, preventing any inopportune manual operation.
                                                                                           The trihydrated alumina and the silica are vacuum dried and degased to eliminate all
                                                                                           traces of humidity and air which could degrade the casting systems dielectric
                                                                                           Half is mixed with the resin and half with the hardner under hard vacuum and controlled
                                                                                           temperature, to give two homogenous premixes.
                                                                                           A new thin film degassing precedes the final mixing. Vacuum casting is then carried out
                                                                                           in dried and pre-heated moulds at an optimal impregnation temperature.
                                                                                           The polymerization cycle begins with a gelification at 80°C and ends with a long
                                                                                           polymerization at 140°C.
                                                                                           These temperatures are close to those of a transformer in service, enabling mechanical
                                                                                           stresses to be eliminated which could lead to the coating cracking.

HV casting process
                                                                                           (1) See page 15 : the anti-fire effects are represented on a section of Trihal coil.

          thermal protection

                                              (   The first level of Trihal protection is
                                                  by the temperature control device.

                                                  The Trihal cast resin transformer can be protected from any damaging temperature rises
                                                  by monitoring winding temperature using various pieces of optional equipment.

                                                  Z thermal protection
                                                  The standard version for naturally cooled (AN) transformers comprises :

                                                     2 PTC sensor sets, positive temperature co-efficient thermistances mounted in
                                                  series : the first set for alarm 1, the second set for alarm 2. The main feature of a PTC
                                                  sensor is the fact that the value of its resistance increases very steeply at a rated and
                                                  factory-set threshold temperature which is not adjustable (see graph opposite). This
                                                  abrupt increase is detected by a Z electronic converter. These sensors are installed
                                                  in the live part of the Trihal transformer with one alarm 1 sensor and one alarm 2
                                                  sensor on each phase. They are placed in a tube, which enables them to be replaced
                                                  as necessary.

                                                                 power supply
                                                                 to measurement            Alarm 2                     Alarm 1
                                   thresold                      circuits                  150 C                       140 C

characteristic graph of a PTC sensor
                                                                 A1    A2    PE              24         21   22   14     11      12          08         05
                                                                                              Alarm 2

                                                                                                                               Alarm 1



                                                                                                        K2              K1                        K0
                                                                                                                                                                ALARM 2        K2

                                                                                                                                                                ALARM 1        K1/K0

                                                                                                                                                                   FAN         K0


                                                                                                                  T      T2       T1         T0             T

                                                                                                                                                                   Third measurement
                                                        Please note the polarity                                                                                   circuit shunted by
                                                           for direct current !                                                                                    a resistance
                                                                                                                                                  R                (on request, third set
                                                                                                                                                                   of PTC sensors
                                                                 A1    A2    PE              24         21   22
                                                                                                                                                                   for the ventilator).
                                                                                              Alarm 2

                                                                 (+)   (–)



                                                                                                                                    1    2        3       4 5       6   7 8    9 10

                                                                                                                                          3 PTC   3 PTC
                                                                                                                                         sensors sensors
                                                                                                                                         Alarm 2 Alarm 1

                                                  Z thermal protection connection diagram (normal use) equipment de-energised

                               thermal protection

                                                                   1 terminal block to connect the PTC sensors to the Z electronic converter.
                                                                The terminal is equipped with a plug-in connector. The PTC sensors are supplied
                                                                connected to the terminal, attached to the top part of the transformer.
                                                                   1 Z electronic converter characterised by 3 independent measurement circuits. 2 of
                                                                these circuits respectively control the variation in resistance in the 2 PTC sensor sets.
                                                                When the temperature increases too much, alarm 1 (or alarm 2) information is
                                                                processed respectively by the 2 independent output relays equipped with a
                                                                changeover contact; the status of these 2 relays is indicated via 2 LED diodes.
                                                                The third measurement circuit is shunted by a resistance R outside of the terminal
                                                                block; it can control a third set of PTC sensors as long as this resistance is removed. In
                                                                this case (“forced air” option available on request), the FAN information is processed
                                                                by a third independent output relay, equipped with a closing contact and is intended to
                                                                control fans; the position of this relay is shown by an LED diode marked FAN.
                                                                In the case of one of these 3 sensor circuits failing (power failure or short circuit), an
                                                                LED diode marked SENSOR lights up and indication of the incriminated circuit flashes.
                                                                An LED diode marked ON signals the presence of voltage to the terminal block.

                                                                                           supply voltage (1)                              AC 230 V*
terminal block to connect sensors to the electronic converter                              voltage tolerance                               – 15 % to + 10 %
                                                                measurement                frequency                                       48 to 62 Hz
                                                                                           input power                                        5 VA
                                                                                           Cumulated resistance of a PTC
                                                                                           sensor circuit for non-activation                   1500 W
                                                                                           of the converter
                                                                                           maximum switching voltage                       AC 415 V
                                                                                           maximum switching current                       5A
                                                                                           switching capacity                              AC 2000 VA
                                                                                                                                           (ohmic load)
                                                                                  rated permanent current                                  AC 2 A
                                                                alarm output and rated operating current                                   AC 2 A under 400 V
                                                                switching contact recommended upstream fuse                                4 A fast
                                                                                  life expectancy           mechanical                     3 x 107 switching
                                                                                             electrical (at maximum power)                 105 switching
                                                                                                                                           0.50 max. with power
                                                                                           load reduction coefficient
                                                                                                                                           factor ϕ = 0.30
                                                                                           permissible ambient
                                                                                                                                           0° C to + 55° C
                                                                                           temperature range
                                                                                           overall dimensions (H x W x D)                  90 x 105 x 60 mm
                                                                                           weight                                          250 g
                                                                Z electronic                                      terminal
                                                                converter                  protection index                                IP 20
                                                                                                                  casing                   IP 20
                                                                                           maximum connection capacity
                                                                                                                                           1 x 2.5 mm2 rigid
                                                                                           to one terminal
                                                                                           fixing method                 either on DIN 35 mm rail
                                                                                                                        or with M4 screw
                                                                The forced ventilation option for AF transformers is detailed page 12.

                                                                (1) must be specified at the order .
                                                                * standardization version. Other voltage on request : AC/DC 24 to 240V tolerance ± 15%.

                               thermal protection

                                                                                   T thermal protection
                                                                                   This thermal protection device gives a digital display of winding temperatures and
                                                                                   includes :

                                                                                     PT100 sensors.
                                                                                   The main feature of a PT100 sensor is that it gives the real time temperature on a
                                                                                   scale of 0°C to 200°C, see graph opposite
                                                                                   (accuracy 0.5 % of the measurement scale 1 deg.).
                                                                                   Temperature control and display functions are performed via a digital thermometer.
                                                                                   The 3 sensors, each comprising 1 white wire and 2 red wires, are installed in the live
                                                                                   part of the Trihal transformer with 1 located on each phase.
                                                                                   They are placed in a tube, which allows them to be replaced if necessary.

                                                                                      1 terminal block to connect the PT100 sensors to the T digital thermometer.
                                                                                   The terminal block is equipped with a plug-in connector.
                                                                                   PT100 sensors are supplied connected to the terminal block fixed to the top part of the
characteristic graph of a PT100 sensor

                                                                                      1 T digital thermometer characterised by 3 independent circuits.
                                                                                   2 of the circuits monitor the temperature captured by the PT100 sensors, one for
                                                                                   alarm 1, the other for alarm 2. When the temperature reaches 140°C (or 150°C) the
                                                                                   alarm 1 information (or alarm 2) is processed by 2 independent output relays
                                                                                   equipped with changeover contacts.
                     PT100 sensors fitted   PT100 sensors outside
                     in the transformer         of the transformer                 The position of these relays is indicated by 2 diodes (LED).
          transformer                                                              The third circuit monitors sensor or electrical supply failure.
                                                                                   The corresponding relay (FAULT), which is independent and equipped with
       terminal block                                                              changeover contacts, is instantly switched as soon as the device is supplied power.
         mounted on
                                                                                   Its position is also indicated by a diode (LED).

      the transformer

                                                                                   A FAN output is intended to control the start up of tangential fans in the case of forced
                                                                  FAN 2            ventilation of the transformer (AF) : this option is shown on page 12.
                                                                  ventilation      An additional input (CH4) can be connected to a sensor outside of the transformer (not
 RS 232 or                                                        of the           supplied), intended to measure ambient temperature in the MV/LV substation.
 RS 485 series                                                    transformer)     An RS 232 or RS 485 series output is available for connection to a plc or computer.
                                                                  24 - 220 V

                                                                                                        supply voltage (1)                    24 V to 220 V AC/DC
                                     monitoring transformer
                                                                                                        frequency                             50-60 Hz AC/DC
                                     of sensor ventilation                         circuits
                                      failures (AF) 130 C                                                                                     10 VA AC/DC
                                                                                                        input power
operating principle diagram for the T digital thermometer                                               maximum switching voltage             250 V AC
                                                                                                        maximum switching current             5 A (resistive circuit)
                                                                                                        rated permanent/operating current     2 A under 220 V AC/DC
                                                                                   alarm output
                                                                                   and tripping         recommended upstream fuse             3A
                                                                                   contact              life expectancy         mechanical    20 000 000 switching
                                                                                                                                electrical    50 000 h/85°C
                                                                                                                                              0.50 max. power factor
                                                                                                        load reduction coefficient
                                                                                                                                              ϕ = 0.30
                                                                                                        operating conditions
                                                                                                        permissible ambient temperature       – 20° C to + 60° C
                                                                                                        ambient humidity                      90% RH (non condensable)
                                                                                                        overall dimensions (H x W x D)        96 x 96 x 130 mm
                                                                                   T digital
                                                                                   thermometer          weight                                520 g
                                                                                                        terminal block protection index       IP 54 self extinguishing
                                                                                                        maximum connection capacity           25 mm2
                                                                                                        on one terminal
                                                                                                                                              92 x 92 mm, flush hole,
                                                                                                        fixing method                          attached with two rear
                                  (1) universal supply irrespective of polarity.                                                              pressure hooks

                                                                                             - 10 -
                               thermal protection

                                                            T thermal protection options available are :
                                                            - FAN 2 output variant to control the start up of an additional fan.
                                                            - RS 232 or RS 485 series output variant for PLC or computer.
                                                            The T digital thermometer is delivered with an installation manual.

                                                            Please note : since the transformer is thermal class F, the user has responsibility for
                                                            setting the T digital thermometer with a maximum temperature of 140°C for alarm 1 and
                                                            150°C for alarm 2.
                                                            Non compliance with these maximum temperatures release France Transfo from any
                                                            liability for damage which may possibly be incurred by the transformer.

                                                            dial type temperature indicator
                                                            This device visibly indicates the temperature of LV winding. The thermometer's dial is
                                                            either installed on the upper crossbar of the transformer with the bracket supplied or on
                                                            the front panel of the protective enclosure.
                                                            The bulb of the capillary sensor is inserted in a tube placed in the transformer's central
                                                            LV winding.
                                                            This thermometer has two changeover contacts, switching on two adjustable
                                                            temperature thresholds (alarm : 140°C and trip : 150°C).

                                                            This thermal protection is not suitable to control fans.

dial thermometer for transformer without enclosure (IP00)

                                                                       - 11 -
           forced ventilation

                            (   Trihal well integrated in its environment.

                                In the event of temporary overloading, to avoid overheating of the windings, it is possible
                                to install forced ventilation.
                                For IP00, for powers greater than 630 kVA, it is possible to install forced ventilation to
                                achieve a temporary increase in power of 25%, without any special modification.
                                In all cases, this temporary increase of 25% can be obtained if detailed on ordering, and
                                can even be taken as high as 40%.

                                However, if an increase in power is requested, account must be taken of the impact of
                                this choice on the following points :
                                - sections of cables and of Prefabricated Busbar Trunking (PBT),
                                - the rating of the transformer's protective circuit breaker,
                                - the size of inlet and outlet openings for air in the transformer room,
                                - the life span of fans in service, which is considerably shortened compared with that of
                                  the transformer (3.5 compared to 30 years).

                                This option includes the supply of :
                                - 2 sets of tangential fans, pre-cabled and connected to 1 single power connector per set,
                                - 1 temperature measurement device, either Z or T type.
                                For Z type, a third set of PTC sensors is added to the standard thermal protection,
                                in place of the R resistor which originally shunts the third Z converter measurement circuit
                                (see diagram shown on the “Z thermal protection” option).
tangential fans on IP00         For T type, the digital converter comprises an output (FAN) intended to start the tangential
                                fans (see diagram shown in the T thermal protection option).

                                This option includes either of the following, dependant on type of transformer :
                                   a wiring box, mounted outside of the protective enclosure, to which are
                                connected, sensors and power supplies for the fan sets on a terminal block,
                                   a control cabinet, delivered separately (transformer IP00) or mounted on the
                                protective enclosure, including :
                                - motor protection fuses,
                                - start up contactors,
                                - thermal protection device.
                                This unit is connected to the temperature sensors and fan sets if the transformer is
                                delivered as IP31. Otherwise, it is the installer who makes the connections.

                                           - 12 -

                                                             low voltage connection :
                                                             Cable ducting interface
                                                             Connection using Prefabricated Busbar Trunking (PBT) provides advantages in terms of
                                                             safety and also saves time during connection, also enabling an installation to be
                                                             produced in conformity with NF C 15100.
                                                             This solution ensures maximum safety for people and property due to its outstanding fire
                                                             behaviour, in line with that of Trihal. It also ensures the absence of halogenated products,
                                                             which is not the case for cabling.
                                                             Moreover, this harmony can also be found in terms of electromagnetic compatibility
                                                             (EMC) : in line with IEC 60076-1, amendment 1 dated September 1999, transformers are
                                                             «considered as passive elements as regards to emissions and immunity to electromagne-
                                                             tic disturbances». For PBT, the concentrating of conductors limits electromagnetic radia-
                                                             tion produced by high currents, as opposed to cables.
                                                             The option includes the connection interface, together with the junction block, with the
                                                             whole assembly delivered already mounted on the LV cable connectors.
                                                             If the protective enclosure is provided for the transformer, a removable aluminium plate
                                                             is screwed to the roof, vertically relative to the junction block.
                                                             It will be adapted on site in order to fit the sealing system connecting the PBT and thus
                                                             enabling the ducting to comply with IP54.
                                                             If the transformer enclosure is supplied, the sealing system is supplied with the PBT.

                                                             Additional cable connectors
                                                             In the case of connection using a large number of cables, additional cable connectors can
                                                             be supplied. It should be noted that the french UTE C15-105 guide dated June 1999
                                                             recommends not exceeding 4 cables per LV phase, and recommends the use of PBT
                                                             beyond this limit.

                                                             medium voltage connection
                                                             Plug-in bushings
                                                             MV connections are always made using cables, terminated with cable lugs or square or
                                                             angled, separable connectors (in this case, cable characteristics must be given).
                                                             These connectors, fitted to the end of the cable, are then connected to plug-in bushings
                                                             which are delivered and fitted :
                                                             - on a horizontal panel, on the top part of the MV side for transformers without a protective
                                                               enclosure (IP00),
                                                             - on the enclosure roof, MV side, for transformers with a IP31 protective enclosure.
                                                             A locking system for connectors can also be supplied and installed in plug-in bushings.
                                                             This system is delivered without any keylocks, but is prepared ready for a keylock either
                                                             RONIS type ELP 11 AP – ELP 1 – ELP 2 or PROFALUX type P1 – P2 – V11 and V21.

250 A MV plug-in bushings and separable connectors on IP31

                                                                        - 13 -
                        protective enclosure
                          vibration damper
                         network protection
                    infre-red measurement

                                                           protective enclosure
                                                           This comes in various versions, according to the protective index required :
                                                           Indoor type with protective enclosure IP31 and IK7
                                                           This enclosure is particularly well suited to installation in work areas in order to provide
                                                           protection of people and property.

                                                           Outdoor type, pole-mounted with protective enclosure IP33 and IK7
                                                           Outdoor type, pad-mounted with protective enclosure IP35 and IK10

                                                           The IP and IK protective indices refer to the following criteria :

                                                           IP protection indices
                                                                                                                    IK protection indices
                                                                      First Figure          Second Figure
                                                           definition protection against    protection against       definition protection against
                                                                                                                                mechanical impact
                                                                      solid bodies          liquids
                                                                                                                     scale**      0 to 10
                                                           scale      0 to 6                0 to 8
                                                                                                                     IK7          protection against mecha-
                                                                      protects against      protects against                      nical impact 2 joules
protective enclosure IP31, IK7                             IP 31      solid bodies          vertical splashing
                                                                      Π2.5 mm              by water                 IK10         protection against mecha-
                                                                                                                                  nical impact 20 joules
                                                                      protects against      protects against
                                                           IP 21      solid bodies          vertical splashing      ** 0 = no protection
                                                                      Π12 mm               by water
                                                                      protects against      protects against
                                                           IP 35      solid bodies          water jets from
                                                                      Π2.5 mm              all directions

                                                           On request, the protective enclosure can be delivered dismantled, protected in a
                                                           transport crate (see attached photo) for on-site assembly, with the help of erecting
                                                           Please consult us.

                                                           vibration damping
                                                           Roller anti vibration pads
                                                           This accessory placed under the rollers, avoids vibrations being transmitted from the
                                                           transformer to its environment.
                                                           Damper unit
                                                           This device is installed in place of the castor and enables transmission of vibrations to the
                                                           transformer environment to be attenuated by around 95 %.

                                                           network protection
                                                           LV overvoltage limiter
                                                           This CARDEW-C, type device meets the requirements of standard NF C 63 150 ; it is
                                                           intended to protect isolated (or impedent) neutral type LV networks against overvoltages.
                                                           This device cannot be installed on LV busbars, or inside the protective enclosure since its
                                                           ambient operating temperature must not exceed 40°C.
enclosure transport box for assembling on site
                                                           MV surge arrestor
                                                           This device is a disconnecting device which has the function of eliminating overvoltages
                                                           from the MV network to earth in order to protect the transformer. It is in conformity with
                                                           IEC standard 99.4, 10 kA, class 1. It can be installed in the protective enclosure, in the
                                                           lower part on the MV side, as long as insulation distances are complied with relative to
                                                           the insulation class.

                                                           porthole for infra-red measurement
                                                           This device enables continuous viewing of LV connections in order to carry out infra-red
                                                           thermographic temperature measurement on these connections at any time, without
                                                           interrupting power supply to the transformer which is being checked.

                                                                      - 14 -

                                                                                              Immediate self extinguishing.
                                                                                              The HD 464 S1* standard defines 3 tests
                                                                                              on one and the same dry standard transformer.

                                       1st anti-fire effect : refracting shield
                                                                                              fire behaviour tests
                                                                                              The fire behaviour test of the Trihal transformer’s casting system is made up of tests on
                                                                                              material and a test F1 according to the HD 464 S1 standard.

                                                                                                 tests on material
                                                                                              Tests on specimens of the Trihal casting resin were carried out by
                                                                                              independent laboratories.
                                                                                                 decomposition products :
                                       2nd anti-fire effect : barrier of water                The analysis and quantity of gases produced by the material’s pyrolisis are carried out ac-
                                                                                              cording to the clauses of standard NF X 70.100, identical to those of standard UTE C
                                                                                              Pyrolisis are carried out at 400, 600 and 800°C on specimens weighing approximately
                                                                                              1 gramme each. This test was carried out by le Laboratoire Central Préfecture de Paris
                                                                                              (Central Laboratory Prefecture of Paris).
                                                                                                 test results :
                                                                                              The table below indicates the average field (in mass of gas/mass of material) obtained
                                                                                              from the values of the three tests carried out at 400, 600 and 800°C. The NS indication
                                       3rd anti-fire effect : temperature held                signifies the results are close to the limit of sensitivity thus lacking precision and therefore
                                       below the fire point
                                                                                              non-significant. The 0 indication signifies that the gases are absent or that their contents
                                                                                              are below the equipments sensitivity.

                                                                                              Central Laboratory Prefecture of Paris
                                                                                              Test certificate number 1140/86 on December 2nd 1986

                                                                                              Decomposition products : gas content/temperatures
                                                                                                                                                                    400°C    600°C    800°C
                                                                                              Carbon monoxide             CO                                        2.5%      3.7%     3.4%
                                                      ance                                    Carbon dioxide              CO2                                       5.2%     54.0%    49.1%
                                                  mpli      d
                                             in co standar                                    Hydrochloric acid           HCI      in the form of            CI-      0        NS       NS
                                            with the .1-S1*
                                                    38                                        Hydrobromic acid            HBr      in the form of            Br-      0         0        0
                                               HD 5
                                                                                              Hydrocyanic acid            HCN      in the form of            CN-      0        NS       NS
                                                                                              Hydroflouric acid           HF       in the form of            F-       0         0        0
                                                                                              Sulphurous anhydride        SO2                                       0.2%     0.17%    0.19%
                                                                                              Nitrogen monoxide           NO                                          0        NS       NS
                                                                                              Nitrogen dioxide            NO2                                         0        NS       NS

                                                                                                 test F1
                                                                                              (as per the HD 464 S1 standard appendix ZC.3)

                                                                                               The STELF Laboratory of the National Prevention
Trihal transformer coil after the test F1                                                      and Protection Center in France.                        CESY Laboratory in Italy
                                                                                               Test report n° PN94 4636 dated 19th avril 1994          Test report n° BC-97/024136
                                                                                               630 kVA n° 601896.01
           temperature ( T)
                                                                                                test method
 420 C                                                                                        A complete Trihal transformer column (HV+LV+core) was placed in the chamber descri-
                                             maximum                                          bed in IEC 332-3 (relevant to electric cables).
369 C
                                             limit                                            The test was started when the alcohol in the tank (initial level 40 mm) was ignited and
                                             for test
                                                                                              when the 24 kW radiant panel was switched on. Test time was 60 minutes in compliance
                                                                                              with standard
 140 C
                                                                                                 evaluation of results
  80 C                                                                                        The temperature rise was measured throughout the test. In compliance with the stan-
  54 C                   Trihal                                                               dard, it remained lower than à 420°C.
   0 C
                                                                                                t = 45 mn : temperature rise was 85°C ( 140°C, and in compliance with standard)
      0'          10'       20'        30'       40'     50'      60'      70'    Time
- switching on of          14' to 18'           40'                           test
                                                                                                            see figure 1,
 radiant panel             end of alcohol       radiant pannel                procedure         t = 60 mn : temperature rise was 54°C ( 80°C, and in compliance with standard)
- ignition of alcohol tank combustion           switched off
                                                                                                            see figure 1.
figure 1
                                                                                              No components such as hydrochloric acid (HCI), hydrocyanic acid (HCN), hydrobromic
                                                                                              acid (HBr), hydrofluoric acid (HF), sulphur dioxide (SO2),
* CENELEC European Harmonisation Document.
                                                                                              formic aldehyde (HCOH) were detected.
                                                                                                                                                        Trihal classified F1.

                                                                                                         - 15 -

                                                              Trihal is resistant to load variations,
                                                              and atmospheric disturbances.

                                                              climatic tests
                                                                 test C2a
                                                              (as per the HD 464 S1*standard appendix ZB.3.2.a)
                                                              Thermal shock

                                                              Kema laboratory in Holland                           CESY Laboratory in Italy
                                                              Test report n° 31813.00-HSL 94-1258                  Test report n° AT-97/038547
                                                              630 kVA n° 601896.01

                                                              The standard HD 538.1-S1 imposes lower than or equal to 20 pC.
                                                              The result for Trihal transformer was  2 pC (1).
                                                              No flashover or breakdown occured during the dielectric tests.

figure 1 : test C2a                                              test C2b in addition**
                                                              (as per the standard appendix ZB.2.2.b)
                                                              Thermal shock

                                                              KEMA laboratory in Holland
                                                              Test report n° 31882.00-HSL 94-1259

                                                              The standard HD 538.1-S1 imposes lower than or equal to 20 pC.
                                                              The result for Trihal transformer was  2 pC(1).
                                                              No flashover or breakdown occured during the dielectric tests.
                                                                                                                   Trihal classified C2.

                                                              environment tests
figure 2 : test C2b
                                                                 test E2a
                                                              (as per the HD 464 S1* standard appendix ZA.2.2.a)
                                                              Condensation and humidity

                                                              KEMA laboratory in Holland                           CESY Laboratory in Italy
                                                              Test report n° 31813.00-HSL 94-1258                  Test report n° AT-97/038547
                                                              630 kVA n° 601896.01

                                                              1 - condensation tests

                                                              Humidity was maintained by continuous water vaporization above 93% (figure 3).
                                                              Within 5 mn of the end of the vaporization, the Trihal transformer was subjected, in the
                                                              climatic chamber, to an induced voltage test at 1.1 Um its rated voltage for 15 mn.
                                                              No flashover or breakdown occured.
figure 3 : test E2a
                                                              2 - humidity tests

                                                              At the end of this period, the Trihal transformer was subjected to applied voltage and
                                                              induced voltage tests at 75% of standard values.
                                                              No flashover or breakdown occured.

                                                                 test E2b in addition**
                                                              (as per the HD 464 S1 standard appendix ZA.2.2.b)
                                                              Condensation and humidity

                                                              KEMA laboratory in Holland
                                                              Test report n° 31882.00-HSL 94-1259

                                                              The Trihal transformer was immersed in salted water at room ambient temperature for a
figure 4: test E2b
                                                              period of 24 hours (figure 4).

                                                              Within the 5 mn, of removal from the water, the Trihal transformer was subjected to an
                                                              induced voltage test at 1.1 Um its rated voltage for 15 mn.
* CENELEC European Harmonization Document.
** two methods (a or b) of manufacturer choice.               No flashover or breakdown occured.
(1) Trihal transformers are guaranteed 10pC.
                                                                                                                   Trihal classified E2.

                                                                        - 16 -

                                                       Partial discharge level guaranteed 10 pC

                                                   (   Insulation 24 kV : impulse tested at 125 kV
                                                       Insulation 36 kV : impulse tested at 170 kV,
                                                       200 kV indeed.
                                                       electrical tests
                                                       These tests verify contractual electrical characteristics.
                                                       They include :

                                                         individual tests (or routine tests).
                                                       These tests are systematically carried out on all Trihal transformers at the end of
                                                       manufacturing and are subject to an official test report (see specimen on the next page).
                                                       They consist of :

                                                          measurement of characteristics :
                                                       - resistance of windings ;
                                                       - transformation ratio and vector group ;
                                                       - impedance voltage ;
                                                       - load losses ;
                                                       - no load losses and no load current.

                                                          dielectric tests :
                                                       - applied voltage tests ;
                                                       - induced voltage tests ;
                                                       - measurement of partial discharge, acceptance criterion :
                                                       • 10 pC at 1.10 Um(1)
                                                       • 10 pC guaranted at 1.375 Un if Um Œ 1.25 Un
                                                       The acceptance criteria is set at 20 pC by standard HD 464 S1, § 20.5.
                                                       Since the life expectancy of the transformer is closely related to the initial PD level
                                                       measured on manufacture, Trihal goes even further by guaranteeing a maximum
                                                       of 10 pC.

                                                         type test.
                                                       They are carried out on request and are at the clients expense.
Ennery assembly line

                                                          lightning test(1)
                                                       The impulse test voltage is usually of negative polarity. The test sequence is composed
                                                       of a calibration impulse between 50 % and 75 % of the full voltage followed by three
                                                       impulses at full voltage.
                                                       The applied is full standardized lightning impulse, see diagram.
                                                       Trihal’s basic offer proposes a choice of impulse withstand levels as standard, according
                                                       to list 2 (see table below), i.e. for 36 kV an impulse test voltage of 170 kV,
                                                       with the possibility of taking these values to 200 kV impulse for an insulation level
                                                       of 38.5 kV.

                                                          temperature rise test
                                                       Carried out according to the simulated loading method. Heating measured by two tests :
        U                                              - one with only no load losses ;
       1,0                                             - the other with only load losses.
       0,9                                             The total temperature rise is calculated in accordance with IEC 726.


                                                       (1) summary of standard test levels

                                               t        system highest
                                                                                             3.6   7.2        12        17.5        24           36
                   T                                    voltage (kV)
                   T1                                   eff. kV 50 Hz - 1 mm                 10     20        28         38         50           70

      front time                T1 = 1,2 s – 30%        impulse kV 1.2/50 µs
      tail time                 T2 = 50 s – 20%         List 1                               20    40         60         75        95        145
      relation between T1 and T T1 = 1,67 T             List 2                               40    60         75         95        125       170

full wave lightning impulse

                                                                     - 17 -

            A clear and precise test report,
            joined to each transformer.

                  - 18 -

                                                special tests.
                                              These are carried out on request and at the expense of the customer.

                                                short-circuit tests
                                              These tests are carried out on a special test rig according to standard IEC 76-5.
                                              Three tests are carried out on each column lasting 0.5 seconds.
                                              Satisfactory tests carried out on a Trihal transformer 800 kVA - 20 kV/410 V dated
                                              29 February 1988 at the EDF Test Centre at Renardières (France).

                                              EDF Renardières Test Centre (France)
                                              Test Report HM 51/20.812 dated 4 March 1988

                                                short circuit withstand test of a Trihal transformer equipped with a PBT* feeder.
                                              Satisfactory test carried out on a Trihal transformer 2500 kVA – 20 kV/400V
                                              400V dated 18 November 1999 at the EDF Renardières Test Centre (France).

                                              EDF Renardières Test Centre (France)
                                              Test Report HM 21/20-998/1 dated 30 November 1999

                                                 noise level measurements :
                                              - noise level measurements are part of the special test carried out on request and
                                                as an option.
                                              - the transformer noise is mainly due to magnetostriction of the magnetic circuit.
                                              - The noise level can be expressed in 2 ways :
                             B                • in terms of acoustic pressure level Lp (A) obtained by calculating the quadratic average
                                              of measurements carried out according to standard IEC 551 at a distance of 1 metre on
                                              a transformer operating under no load ;
                                              • in terms of acoustic power level Lw (A) calculated from the acoustic pressure level using
                                              the following formula :
                                              Lw (A) = Lp (A) + 10 log S

                                              Lw (A) = weighted acoustic power level in dB(A) ;
                            D         P       Lp (A) = average level of acoustic pressure measured in dB(A) ;
                                              S      = equivalent surface area used for the calculation in m2 ;
                                                     = 1.25 x H x P ;
                                                     with H = height of transformer in metres ;
P = 2 (A + B + D )                                   and P = measurement contour perimeter at a distance D.
D = 1 m for Trihal IP00
D = 0.3 m for Trihal with enclosure

                                              * Prefabricated Busbard Trunking.

                                                           - 19 -

 (   Trihal, direct access via the internet!

 All the information you need to install and use
Trihal, can be sent to your Internet address right
from the quotation stage :
  drawings with dimension tables to prepare
  the installation and environmental
  integration of the device,
  installation, commissioning and
  maintenance instructions to ensure that
  your equipment lasts its expected life.
Moreover, as soon as you place your order, you
will be able to obtain definitive drawings of your
transformer in DXF format.

But also :
 general descriptive specifications of our cast
 resin transformer,
 technical datasheets with the electrical and
 mechanical performance levels for each
 the factory testing procedures for each
 device we manufacture.

And if you want proof of Trihal’s adaptability, we
can also e-mail you :
  E2-C2-FI certifications which define Trihal’s
  ability to adapt to even the harshest condi-
  lists of references by country, by power, by
  voltage, by vector group, by product range,
  by insulation, by geographical zone.

Your Schneider contact will provide all this infor-
mation within 48 hours !

                                                      - 20 -
- 21 -

                                                                                    ( Easy and fast installation.

                                                                                     general information
                                                                                     Due to the absence of any liquid dielectric and the excellent fire behaviour of Trihal
                                                                                     transformers, no anti-fire precautions are necessary providing the following guidlines
                                                                                     are followed :

                                                                                        the transformer should not be installed in a flood hazard area ;
Trihal transformaters (IP 00) installed on the universal exhibition from Seville,
                                                                                        the altitude should not be above 1000 metres unless a higher altitude is specified
Expo 92                                                                              at the time of enquiry ;
                                                                                        the ambient temperature for the transformer to be within the following limits :
                                                                                     - minimum : – 25°C ;
                                                                                     - maximum : + 40°C (unless a higher temperature is designed for based on information
                                                                                       provided at the time of enquiry).
                  X                                                                  Standard transformers are designed in accordance with IEC 76 for an ambient
                                                                                     temperature of :
                                                                                     • maximum : 40°C
           X                                                       X                 • daily average : 30°C
                                                                                     • yearly average : 20°C.

                                                                                        the local ventilation should allow the dissipation of the transformer total losses,
                                                                                     including increased losses during AF operation.
                                        X                                               in highly polluted atmospheres (metal machining oil, conductive dust), the air
                                                                                     coming into contact with the device should if possible be cleaned (filtering, inlet of
                                                                                     outside air via a ducting).
                                                                                        the transformer even with IP 31 metal enclosure is designed for an indoor
figure 1 - insulation distance without enclosure IP00                                installation (please consult us for an outdoor installation).
                                                                                        provision should be made for access to connectors and tapping links.
                                                                                        for mobile installations please consult us.

                                                                                        Trihal without enclosure (IP 00) (figure 1).

                                                                                     In this configuration, even with plug-in bushings, the transformer must be protected
                                                                                     against direct contact.

                                                                                     In addition :
                                                                                        care must also be taken to eliminate risks of water drops on the transformer
                                                                                     (example : condensation from overhead pipings) ;
                                                                                        maintain minimum clearance to the walls according to the following table :

                                                                                                                       dimensions X in mm(1)
                                                                                       Insulation (kV)
                                                                                                                     full wall              ventilation grill
Trihal transformers with IP 31 metal enclosure installed in a steel works                     7.2*                      90                        300
                                                                                              12*                      120                        300
                                                                                             17.5*                     160                        300
                                                                                              24*                      220                        300
                       200 mm                                                                 36*                      320                        400

      200 mm

                                                                                     (1) do not take account of access to the variation tapping links.
                                                                                     *according to NF C 13-100 and HD 637 S1.

                                                                                     Please consult us if any of these distances can not be achieved.
                                                                     200 mm

                                                                                       Trihal with IP 31 metal enclosure (figure 2).
                                    HV                                               A minimum distance of 200 mm between the exterior of the enclosure and the walls of
                                                                                     the building should be maintained to ensure adequate cooling.

                                              500 mm*

figure 2 insulation distance with enclosure
 *access to the variation tapping links.

                                                                                                   - 22 -

                                                                substation ventilation
                                                                  determination of the height and area of ventilation grills.

                                                                In the general case of natural cooling (AN), the ventilation of the substation or of the
                                                                enclosure must ensure by natural convection the dissipation of the heat produced by the
                                                                transformer’s total losses.
                                                                In the case of a sufficiently ventilated substation, appropriate ventilation will consist of a
                                                                fresh air intake opening of S section at the bottom of the substation and an outgoing air
                                                                opening S’ located above on the opposite wall at height H metres above the intake
                                                           S’   opening (figures 1 and 2).
                                                                To ensure efficient cooling of the transformer and sufficient air circulation, it is essential
                                                                to maintain a minimum height of 150 mm under the live section, by installing castors or
                                                                an equivalent booster.
                                                                It must be noted that restricted air circulation reduces the transformer’s continuous and
               H                                                short term overload capacity.

                                                                  formula for ventilation (figure 1) :
                                                                    0, 18P
                                                                S = ---------------- and S' = 1, 10 × S
                                               H minimum        P = sum of the transformer’s no-load and load losses expressed in kW at 120°C.
                                               = 150 mm
                                                                S = area of the lower air intake opening (allow for mesh factor) expressed in m2.
                                                                S’ = area of the air outlet opening (allow for mesh factor) expressed in m2.
                                                                H = height difference between the two openings expressed in metres.
figure 1 - substation natural ventilation                       This formula is valid for an average ambient temperature of 20°C and
                                                                an altitude of 1000 m.
                                                                Example :
                                                                - one single Trihal transformer 1000 kVA,
                                                                - Po = 2300 W, Pcc at 120°C = 11000 W,
                                                                                          i.e. P = 13.3 kW.
                                                                If the distance between the grills = 2 m, then S = 1.7 m2 of net surface area necessary.
                                                                If we imagine a grill obstructing the air inlet by 30% ; the air inlet grill surface area should
                                                   S’           then be 1.5 m 1.5 m, and that of the air outlet should be 1.5 m 1.6 m.

                                                                  substation forced ventilation (figure 2) :

                                                                Forced ventilation of the substation is necessary for ambient temperatures above 20°C,
               H                                                or small or badly ventilated rooms for applications with frequent overloads.
                                                                The fan can be thermostat controlled and operate as an extractor in the top part of the
                                                                Advised flow (m3/second) at 20°C = 0.1 P.

                                                                P = sum of the transformer’s no-load and load losses expressed in kW at 120°C.
                                              H minimum
                                              = 150 mm

figure 2 - substation forced ventilation

                                                                           - 23 -

                                                                (   The incoming HV and LV connections
                                                                    can be made from the top or the bottom.

                                                                    MV side connections are made by cables.
                                                                    LV side connections are made conventionally by cables, but can also be made using the
                                      cable                         «very safe» alternative using Prefabricated Busbard Trunking (PBT).
                                      support                       In all cases shown the cables or busbars must be supported to avoid mechanical stress
                               LV       n                  HV       on the HV or LV terminals or HV plug in connectors.
                                                                    The HV connections should be made to the top part of the delta connection bars. The LV
                                                                    connections are made at the top of the transformer.

                                                                    Warning :
                                                                    - The distance between HV cables or busbars and the surface of the winding should be
                                                                      at least 120 mm except on the flat face of the HV side where the minimum clearance will
                                                                      be set by the HV terminal.
                                                                    The clearance to the outer HV delta bar should also be a minimum of 120 mm.
                                                                    - The resin coating, or the use of plug in connectors does not give protection against
                                                                      direct contact and the transformer must not be touched when it is energised.
                                                                    - The overvoltage limiter (type CARDEW.C) can not be installed on the transformer LV
                                                                      busbars : the working temperature can not exceed 40°C (unless specifically designed
                                                                      for higher temperatures).
figure 1 - standard HV and LV connections from above
                                                                       Trihal without metal enclosure (IP 00).
                                                                       standard HV and LV connections.
                                                                    - The outgoing (or incoming) LV conductors can be made from above or below (figures 1
                                                                      and 2).
                                                                    - The outgoing (or incoming) HV conductors can be made from above or below (figures 1
                                                                      and 2).
                                                                    In the case of an outgoing (or incoming) conductor from below it is necessary to put a
                                                                    spacer (spacer will not be supplied by France Transfo).
                                                                       HV connections with plug in connectors (figure 3).

                                                                       LV connections using prefabricated electrical ducting (figure 4).
                                                                    On site installation is simplified as far as possible, with very easy fitting, assembly and
                                                                    dismantling :
                                                           HV       -the transformer is delivered pre-equipped with the PBT connection interface,
                       120                           120
                       minimum                           m
                                                     minimum        -the possibility of adjusting on site by ± 15 mm in all 3 directions,
                                                                    -connection and disconnection is achieved within an hour at most providing optimum
                                                                      continuity of service.

                                                                    As an example, the french guide C 15-005 recommends not exceeding 4 cables per LV
                                                                    phase, a limit which does not exist for PBT, which should therefore be used beyond this.
                                                                    PBT/Trihal interface connection, tested in the factory, guarantees conformity of the
                                                                    installation to NF C 15-100.
figure 2 -standard HV and LV connections from below


                               LV       n                  HV

                       120                           120

figure 3 - HV connections with plug in connectors                           LV connections using prefabricated electrical

                                                                               - 24 -

                                                                                 Trihal with IP 31 metal enclosure.
                                                  HV                              standard HV and LV connections (figures 1 and 2).
                                                                               - The outgoing (or incoming) LV conductors must go upwards from the terminals under
                                LV    n
                                                                                 the enclosure cover. The LV conductors should never pass between the HV coils and
                                                                                 the enclosure.
                                                              cables support
        cables support

                                                                               - The outgoing (or incoming) HV conductors can pass above (figure 1) or below (figure 2).

                                                                                   HV connection from below.
                                                                               - The outgoing (or incoming) HV conductors can come from below directly to the
                                                                                 connection terminal (figure 2). In this case incoming conductors are passed through the
                                                                                 removable flap door located at the bottom right of the HV side.
                                                                               - The HV cables must be fastened inside the enclosure on the HV side panel. Two blanked
                                                                                 off holes with screw nut system are provided for fitting cables inside the enclosure on
                                                                                 the HV side (figure 2) (the fixing system is not supplied by France Transfo).
                                                                               It is advisable to verify the feasibility of this type of connection in relation to the section
                                                                               and the bending radius of cables and the space available in the enclosure.

                                                                                 HV connection by plug in connector (figure 3).
                                                                                 LV connections using prefabricated electrical ducting (figure 4).
figure 1 - standard HV and LV connections from above
                                                                               Warning :
                                                                               It is necessary to verify conformity with the IP31 protection index after having drilled the
                                                                               insulation gland plate for HV, LV and other.


figure 2 -standard HV connection from below

                                     LV          HV
                                                              cables support
               cables support

figure 3 - HV connections with plug in connectors (option)                                                      figure 4 - LV connections with PBT and enclosure

                                                                                          - 25 -

               (   For a safe installation...

                          - 26 -

      admissible temporary
                                                                                  general information
       overloads for daily                   acceptable short time
           load cycle                             overloads                       The transformers are designed to operate at rated power at ambient temperature defined
                                                                                  by IEC 76 :
                    annual ambient temperature                                    - maximum : 40°C ;
                             + 10 C                                               - daily average : 30°C ;
      % of rated power                       rated current multiple               - yearly average : 20°C.
                                               x In
                                       10                                         Without particular specification, the reference temperature is the annual average of 20°C.
150                                     8
                                                            0,7                     overloads are allowed without reducing the transformer’s service life if they are
              0,8                                                 0,5             compensated by a normal load below the rated power.
120                                                                                                              load
                                        4                                             K                                                       -
                                                                                            = -------------------------------------------------
                                                                                                      rated power
                                                                                  The admissible overloads are also subject to the average mean ambient temperature.
        2 4 6 8 10 12                        5 10    30           60              The 1st column gives the cyclical daily overloads.
                   hours                                           seconds        The 2nd column indicates the acceptable short time overloads.
                    annual ambient temperature                                      the figure below shows the acceptable constant load as a function of the average
      % of rated power                       rated current multiple               temperature compatible with normal life duration.
                                              x In
                                        8                   0,8
              0,8                                                 0,7
                                        6                                   0,5
        2 4 6 8 10 12                         5 10    30              60
                   hours                                              seconds

                    annual ambient temperature                                    100
                              - 10 C
      % of rated power                       rated current multiple
                                               x In
                                        10                                         90
150           1                          8                0,9
140               0,6                                           0,8
                                         6                            0,7
120                                                                         0,5                 x – 30                   x – 20                   x – 10    x       x + 10
                                         4                                        ambiant temperature in °C
                                                                                  (x = annual average temperature)
100                                      2

        2   4 6     8 10 12                  510     30           60
                         hours                                     seconds

overloads graphs according to the ambient temperature                               one can operate a transformer designed for operation in yearly average ambient
                                                                                  temperature of 20°C at higher temperatures by reducing the rating as shown in the
                                                                                  table :

                                                                                          yearly average                                                   admissible
                                                                                        ambient temperature                                                  load
                                                                                                        20°C                                                    P
                                                                                                        25°C                                                0.97 x P
                                                                                                        30°C                                                0.94 x P
                                                                                                        35°C                                                0.90 x P

                                                                                                  - 27 -

                                                                                                                                          The transformers are equiped with provisions for safe handling.

                                                                                                                                             lifting with slings (figure 1).
                                                                                                                                          Lifting is carried out using the 4 lifting holes for a transformer without an enclosure and by
                                                                                                                                          2 lifting lugs in the case of a transformer with an enclosure. The slings should not form an
                                                                                                                                          inside angle greater than 60°.

                                                                                                                                            lifting with a fork lift truck (figure 2).
loading in our factories
                                                                                                                                          The lifting capacity of the fork lift truck should first be checked. If suitable, the forks should
                                                                                                                                          be inserted inside the base channels after removing the rollers.

                                                                                                                                          Towing the transformer with or without enclosure should be done from the underbase.
                                                                                                                                          For this purpose hole of 27 mm. diameter are provided on every side of the underbase.
                                                                                                                                          owing can be done in two directions : in the axis of the underbase and perpendicular to
                                                                                                                                          that axis.

                                                                                                                                             fitting the rollers.
                                                                                                                                             either by lifting with slings (figure 1) ;
                                                                                                                                             or by lifting with a fork lift truck (figures 1 and 2).
                                     maximum                                                                                              In this case position the lifting forks in the underbase channels.
                                                                                                                                          Place timbers of greater height than the rollers under the channels and lower the
                                                                                                                                          transformer on to them.
                                                                                                                                          Position jacks and remove the planks.
                                                                                                                                          Attach the rollers in the desired position (bi-directional rollers).
                                                                                                                                          Lower and remove allowing the Trihal to rest on its rollers.

                                                                                                                   n 216 452

                                                                                                                                          The Trihal transformer should be protected in storage from water drops and dust
                                                                                                                                          generating work (masonry, sanding, etc.). If the Trihal transformer is delivered with a
                                        Groupe Merlin Gerin Æ Usine de Maizi res-l s-Metz (Moselle) France   n… 216540

                                                                                                                                          plastic cover which should be kept over the equipment whilst it is in storage.

                                                                                                                                          The Trihal transformer can be stored at a temperature down to - 25°C.

                     Fork lift truck lifting points

figure 1 - lifting with slings or fork lift truck



figure 2 - fitting the rollers

                                                                                                                                                     - 28 -

                                    (   An instruction manual for installation
                                        and commissioning is attached to each transformer.

                                          installation local (see page 22 and 23).
                                        The location should be dry, clean, finished and free from risk of water entry.
                                        The Trihal transformer should not be installed in an area liable to be flooded.
                                        The location should have sufficient ventilation to ensure the transformers total heat losses
                                        can be dissipated.

                                            checking the condition after storage.
                                        If the Trihal transformer is found accidentally to be very dusty, clean it by vacuum cleaner
                                        or by blowing with compressed air or nitrogen and thoroughly clean the insulators using
                                        paper towels.

                                          Trihal transformers supplied with a plastic cover.
                                        To avoid contamination by foreign bodies (screws, nuts, washers, etc.), the cover should
                                        remain in place during the whole connecting operation : to gain access to HV and LV
                                        connections tear the cover.

                                           Trihal transformer supplied with metal enclosure.
                                        The enclosure should in no place support loads other than the supply cables for the
                                        The installation inside the enclosure of unauthorised equipment or accessory not
                                        supplied by France Transfo except the connection cables correctly installed as shown in
                                        the relevant section, is not permitted and invalidates the guarantee.
                                        For any modifications, attachements and mounting of accessories, please consult us.

                                           HV and LV connections cables (see page 13).
                                        In no case should fixing points be made on the transformer core and windings.
                                        The distance between the HV cables, the LV cables, or the LV bars and the surface of the
                                        HV winding should be at the least 120 mm. except on the high voltage side where the
                                        minimum distance is to be considered from the most protruding delta connection.

                                        Particular care should be taken concerning the earthing of MV cable shields.
                                        The distance of 120 mm should be complied with between earthing cables and the
                                        surface of the MV winding.

                                          connection of HV connectors.
                                        Connection tightening torque on the HV terminal and tapping links with flat + contact
                                        washers (brass screws) :

                                        tightening torque for bus bars bolts   M8            M10           M12          M14
                                        tightening torque mkg                  1             2             3            5

                                          connection of LV connectors.
                                        Connection tightening torque for the LV bars :

                                        tightening torque for bus bars bolts    M8        M10        M12         M14       M16
                                        tightening torque mkg                   1.25      2.5        4.5         7         10

                                           case of reactive energy compensation : i.e. an installation combining transformers,
                                        capacitor banks and LV switchboards.
                                        When the capacitor banks are installed in the direct vicinity of transformers, capacitor trip
commissioning after checking            currents can lead to over voltages which risk damaging the transformers and the
                                        capacitors. Conditions are made worse when the MV supply is a long away from the MV
                                        incomer cubicle. Schneider proposes inserting a pre-insertion resistor :
                                        contactor LC1-D.K.

                                                   - 29 -

                                                    auxiliary wiring.
                                                 Auxiliary wiring from the transformer (connection to the plug-in connectors) should be
insulation            minimum clearance (mm)     attached on rigid supports (without any ties) and have sufficient clearance from live parts.
                                                 The minimum clearance to respect is determined by the insulation voltage indicated on
7.2                   270
                                                 the rating plate. See the opposite table.
12                    450
                                                 Do not fix accessories etc… to the core and windings of the transformer.
17.5                  450
24                    450
                                                   parallel operation.
                                                 Verify the identity of the HV and LV voltages and the compatibility of characteristics and
                                                 especially the vector groups and the impedance voltage.
                                                 Make sure that the same tapping is selected for transformers to be coupled in parallel
                                                 according to the HD 398 standard.

                                                   checks before commissioning :
                                                   remove the protective cover and check all the connections (arrangements,
                                                 distances, tightening torques) ;
                                                   check cable and bus bars entries after connection to ensure IP rating has been
                                                 maintained ;
                                                   verify the position identity of tapping links on the three phases are in accordance
                                                 with the diagram on the rating plate ;
                                                   verify the transformers general state of cleanliness and carry out an insulation test
                                                 verifying HV and LV earth and HV and LV insulations using a 2500 V insulation tester

                                                 The approximate values of resistances are :

                                                 HV/earth      = 250 M
                                                 LV/earth      = 50 M
                                                 HV/LV         = 250 M

                                                 If the values measured are significantly below, verify the transformer is not moist. If it is,
                                                 dry it with a rag and repeat the verification.

                                                 In the contrary please contact your Schneider correspondent.
checking before commissioning

                                                 In normal use and environment at conditions inspect the transformer each year and
                                                 vacuum clean or blow with dry compressed air to remove excessive dust.
                                                 The frequency of cleaning will be a function of service conditions.
                                                 During such maintenance the connection bolts should be checked for tigtness using a
                                                 torque wrench.
                                                 In the case of greasy dust deposits, only use a cold degreasing product to clean the resin

                                                 after sales services
                                                 For any information or replacement parts it is essential to quote the main characteristics
                                                 on the rating plate and especially the transformers serial number.

                                                            - 30 -
after sales service

                                the experience of a major manufacturer

                            (   international competency
                                swift assistance
                                a quality service
                                getting your transformer energised
                                Commissioning assistance
                                Our after sales technicians make sure your France Transfo equipment is correctly

                           72   Telephone assistance
                                If you have a question or a problem, just pick up the phone.
                                We are at your disposal every day between 9.00 and 19.00 (French time).

                           12   Schneider Electric on call service
                                In the event of an emergency outside of these times,
                                you can contact Schneider Electric’s on-call service.

                                Extended warranty
                                In order to go further in partnering your equipment, on request and under certain
                                conditions, we are able to propose an extented warranty for your transformer.

                                France Transfo’s TRIHAL transformer technology means that full on site repairs are
                                possible, even under difficult access conditions.

                                Training suited to each type of equipment is given throughout the world.


                                Replacement part emergency supply
                                The after sales service has a large stock of replacement parts, as befits a major
                                transformer manufacturer, thus enabling us to supply standard parts with very qick
                                delivery times.
                                Moreover France Transfo’s engineering office and ten year archives mean that you
                                benefit from a solution that is perfectly suited to your application.

                                Assembly or supervised assembly

                                            - 31 -
                                    applies environmental management principles
                                            developed by Schneider Electric
                    the advantages                                                   the guarantees
                    for the development of customer                                  for a lasting development with :
                    and partner relations with :
                                                                                     An environmentally-friendly product development using
                     Better involvement of personnel;                                news techniques to better conserve natural resources.
                     Increased responsibility for management teams;
                                                                                     Thanks to current methods, the choice of the configuration and
                     A contribution to reducing the consumption of power, water      components of products makes allowance for their environmental
                     and raw materials;                                              impact.
                     A privileged qualification of Schneider Electric as supplier;
                     Specific sales assistance for our customers and partners :      A continuously improvement of the environment protec-
                     sales argument, export sales dynamics.                          tion at all the sites by generalising the implementation of a com-
                                                                                     mon environmental management system.
                                                                                     The organisation will be based on an international standard :
                                                                                     the ISO 14001.

France Transfo SA                          France Transfo                                     Due to the evolution of standards and materials, the
                                           BP 10140                                           present document will bind us only after confirmation
                                           F-57281                                            from our technical department.
                                           Maizières-lès-Metz cedex
                                           tél : 33 (0)3 87 70 57 57
                                           fax: 33 (0)3 87 51 10 16
                                                                                              Publication : Schneider Electric SA
                                                                                              Conception, réalisation : COREDIT
AMTED 301020EN                             RCS Nanterre B 954 503 439                         GEa 17 i
ART. 27347                                                                                                                                                05/2001

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